VERILAST◊ Technology for Knees

Partial and Total Knee Joint Replacement Surgery

Product Information

What is VERILAST◊ Technology for Knees?

VERILAST technology is the first device to combine an OXINIUM◊Oxidized Zirconium femoral component with a highly crosslinked ultra-high molecular weight polyethylene (UHM-WPE) tibial insert to form an advanced TKA bearing.

Lab-tested to simulate the number of steps the average person takes in 30 years*

Offers the younger, more active patients a TKA solution designed to address their increased expectations for wear performance.

An often used solution in total knee replacement for patients with metal sensitivity.

VERILAST Technology is offered for the following knee implants:

When used with our LEGION ◊Total Knee System , it demonstrated an impressive 81% reduction in wear in simulated lab testing compared to conventional materials. Plus, wear simulation indicates that the LEGION Cruciate Retaining Knee System with VERILAST Technology may last up to 30 years of wear - that's twice the current industry standard of 15 years.*

*Based on in-vitro wear simulation testing, the LEGION◊ CRPrimary Knee System with VERILASTtechnology is expected to provide wear performance sufficient for 30 years of actual use under typical conditions. The results of in-vitro wear simulation testing have not been proven to quantitatively predict clinical wear performance. Also, a reduction in total polyethylene wear volume or wear rate alone may not result in an improved clinical outcome as wear particle size and morphology are also critical factors in the evaluation of the potential for wear mediated osteolysis and associated aseptic implant loosening. Particle size and morphology were not evaluated as part of the testing.

Research

VERILAST◊ Research

VERILAST 2010 Wear-Reduction History White PaperHistory of Wear-Reduction Technology in Total Knee Arthroplasty To reduce the number of TKA revisions, sustainable improvements in the longevity of total knee arthroplasty require a system-wide approach of optimizing the design along with using advanced bearings. VERILAST Technology in the LEGION Primary Knee System is the only TKA solution available that has United States and European Union claims for expected wear performance that is sufficient for 30 years of actual use under typical conditions

VERILAST - An Advanced Bearing System for TKAWhite Paper Morrison, Mark, PhD.; Parikh, Amit, BS; Jani, Shilesh, MS Implant design and materials selection play an important role in the wear-related performance of TKA. It is widely recognized that excessive wear of UHMWPE tibial inserts can result in mechanical implant instability and, in some instances, catastrophic wear.

*Based on in-vitro wear simulation testing, the LEGION◊ CRPrimary Knee System with VERILASTtechnology is expected to provide wear performance sufficient for 30 years of actual use under typical conditions. The results of in-vitro wear simulation testing have not been proven to quantitatively predict clinical wear performance. Also, a reduction in total polyethylene wear volume or wear rate alone may not result in an improved clinical outcome as wear particle size and morphology are also critical factors in the evaluation of the potential for wear mediated osteolysis and associated aseptic implant loosening. Particle size and morphology were not evaluated as part of the testing.

Design

Every TKA implant is composed of two bearing surfaces:

1. Polymeric tibial component 2. Hard femoral component.

Previous attempts to improve wear resistance only involved the polymeric tibial component, but both components affect the wear performance of the couple. Ceramics have shown superior wear in hips 25, and Smith & Nephew is the only company that can provide a ceramic bearing surface for TKA.

By improving both bearing components, we created a system-wide solution with industry-leading wear resistance. The result? VERILAST◊ Technology, the only advanced bearing couple for TKA, which features OXINIUM◊ Oxidized Zirconium femoral components used in conjunction with 7.5 Mrad highly crosslinked, re-melted UHMWPE tibial inserts.

VERILAST technology combines Cross Linked Polyethylene with our OXINIUM Technology which has been proven to be twice as hard as CoCr but 49 times more abrasive resistant than CoCr, which reduces wear in both pristine and roughened conditions.

Smith & Nephew XLPE for TKA is manufactured from compression molded GUR 1020, and is gamma - irradiated at 7.5Mrad and subsequently re-melted. It has been proven to balance significant wear reduction but also maintains mechanical properties. We have done this with our high flex designs, which minimize the potential for sheer forces.

For more detailed information, contact your local sales representative or call Customer Service at 1-800-238-7538.

*Based on in-vitro wear simulation testing, the LEGION◊ CRPrimary Knee System with VERILASTtechnology is expected to provide wear performance sufficient for 30 years of actual use under typical conditions. The results of in-vitro wear simulation testing have not been proven to quantitatively predict clinical wear performance. Also, a reduction in total polyethylene wear volume or wear rate alone may not result in an improved clinical outcome as wear particle size and morphology are also critical factors in the evaluation of the potential for wear mediated osteolysis and associated aseptic implant loosening. Particle size and morphology were not evaluated as part of the testing.

Living Proof

Living Proof - VERILAST◊

This includes Smith & Nephew clinical history studies for LEGION◊ Total Knee System including GENESIS◊ II.